2020
1st International Conference of Soil and Agriculture:
TOWARDS SOIL SUSTAINABILITY
11–13 June 2024 • Lublin–Nałęczów, Poland
https://doi.org/10.24326/ICSA1.2.06
Published online: 4 October 2024
Study of absorption amount of potassium released
from silicate minerals as a result of inoculation with
new-combined periphyton by rice plant (Oryza Sativa)
Shahrzad Zandparsa*, Hossein Ali Alikhani, Hassan Etesami
Department of Soil Science and Engineering, College of Agriculture and Natural Resources, University of Tehran
* Corresponding author:
Abstract
Potassium is a crucial plant nutrient essential for growth, development and metabolic processes. Although soil contains abundant potassium, only a small fraction, typically 1–2%, is readily available to plants. This limited accessibility stems from potassium being locked within silicate minerals. However, soil microorganisms, including fungi and bacteria, play a pivotal role in liberating potassium from these minerals by breaking down their crystal structures. Periphyton, a biofilm that thrives by adhering to solid surfaces in aquatic environments, particularly in shallow, flooded areas, plays a significant ecological role. When periphyton forms on soil surfaces, it is termed “Epipelon”. The primary components of periphyton formation (algae, bacteria, fungi, protozoa and metazoa) play an important role in the cycle and transfer of nutrients between water and soil surface in aquatic ecosystems, including paddy fields, and as a result, in the growth of rice plants. So far, no study has been done in Iran on this biological layer and its role in the potassium cycle in paddy fields. The purpose of this study is to investigate the effect of natural and new-combined periphyton with potassium-soluble microorganisms on growth indicators and potassium content of rice plants treated with the silicate minerals phlogopite and muscovite under greenhouse conditions. From 20 Epipelon samples collected from the paddy fields of Gilan province, periphytons No. 13, 6, and 18 were identified as the best isolates for their ability to dissolve potassium. These were selected for further evaluation in a factorial experiment using a completely randomized design with three replications. The experiment tested eight different treatments of recombinant periphytons with bacteria and fungi, four potassium sources (muscovite, phlogopite, K2SO4, and potassium-free), plant treatments (with and without rice seedlings) and five time points (1, 7, 14, 21, and 28 days), totalling 192 test units. The results showed that recombinant periphytons with superior microorganisms could dissolve various potassium sources, with the highest dissolution from phlogopite. Rice seedlings utilized the replaced potassium source from the environment and the recombinant periphyton as a temporary reservoir. Additionally, recombinant periphytons increased plant phosphorus. This method can enhance periphyton efficiency and be used for potassium management in paddy fields.
Keywords: Epipelon, silicate bacteria, phlogopite, potassium, muscovite
How to cite
Zandparsa S., Alikhani H.A., Etesami H., 2024. Study of absorption amount of potassium released from silicate minerals as a result of inoculation with new-combined periphyton by rice plant (Oryza Sativa). 1st International Conference of Soil and Agriculture: Towards Soil Sustainability. https://doi.org/10.24326/ICSA1.2.06
